An ultra-marathon is a long-distance running event that exceeds the standard marathon distance of 26.2 miles (42.2 kilometers). These races can vary in length, typically starting at 50 kilometers (31 miles) and going up to 100 miles (160 kilometers) or more. Ultra-marathons can take place on roads, trails, or a combination of both, and they often involve challenging terrains and varying weather conditions. Participants in ultra-marathons must prepare extensively, as the physical and mental demands are significant. Runners often use strategies such as pacing, nutrition, and hydration to complete these grueling events. Popular ultra-marathon events include the Western States Endurance Run and the Badwater Ultramarathon.